JTRF2014, the JPL Kalman filter and smoother realization of the International Terrestrial Reference System

2017 ◽  
Vol 122 (10) ◽  
pp. 8474-8510 ◽  
Author(s):  
Claudio Abbondanza ◽  
Toshio M. Chin ◽  
Richard S. Gross ◽  
Michael B. Heflin ◽  
Jay W. Parker ◽  
...  
Keyword(s):  
Kalman Filter ◽  
Reference System ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System

scholarly journals Determination of the relationship between Vietnam national coordinate reference system (VN-2000) and ITRS, WGS84 and PZ-90

2019 ◽  
Vol 94 ◽  
pp. 03014
Author(s):  
Hoa Pham Thi ◽  
Dung Nghiem Quoc ◽  
Thu Trinh Thi Hoai ◽  
Huynh Pham The ◽  
Nhung Le Thi
Keyword(s):  
Reference System ◽  
Least Square ◽  
National Coordinate ◽  
Least Square Approach ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System ◽  
The Common ◽  
Transformation Parameters ◽  
The Relationship

In July 2000, Hanoi-72 reference system was replaced by the Vietnam reference system, namely as VN-2000 as an official geodetic background system in Vietnam. Ministry of Natural Resources and Environment of Vietnam has reported the transformation parameters between VN-2000 and WGS84. Nevertheless, there is a need to estimate a new transformation parameter set between VN-2000 and WGS84 because WGS84 has been updated. In addition, there is now a lack of an accurate published set of parameters for transformation from VN-2000 to not only the International Terrestrial Reference System ITRS but also PZ-90. In this study, coordinate transformation parameters between ITRS and VN-2000 are estimated through the use of a least square approach and the common points with known coordinates in both systems. These set of parameters was then deployed to determine the link between VN-2000 and WGS84 as well as PZ-90. The results denoted that the derived transformation parameters, on the basis of the results at the checkpoints, could generated station positions with the accuracy at several cm level for transformation from VN-2000 to the new realizations of ITRS, WGS84 and PZ90 and reversely. These achievements reveals that the set of parameters is great significance for many applications related to positioning in Vietnam.

scholarly journals Kinematical Relativistic Corrections for Earth’s Rotation Parameters

2000 ◽  
Vol 180 ◽  
pp. 293-302 ◽  
Author(s):  
V.A. Brumberg ◽  
Pierre Bretagnon
Keyword(s):  
Reference System ◽  
Earth’S Rotation ◽  
Euler Angles ◽  
Experimental Check ◽  
Earth's Rotation ◽  
Relativistic Corrections ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System ◽  
Rotation Parameters ◽  
The Relationship

AbstractDynamical theories of the Earth’s rotation like SMART97 (Bretagnon et al., 1998) are to be considered in a DGRS (dynamically nonrotating geocentric reference system) (Brumberg et al., 1996). Such a theory gives the explicit expressions in terms of TCG (Geocentric Coordinate Time) of three Euler angles relating a DGRS to the ITRS (International Terrestrial Reference System). These angular quantities together with their TCG derivatives enable one to get all Earth’s rotation parameters. At the same time, the analysis of observations result in the values for slightly different angles and their TCG derivatives characterizing the relationship between the ITRS and a KGRS (kinematically nonrotating geocentric reference system). The differences between these two sets of six quantities represent kinematical relativistic corrections (due to geodesic precession, geodesic nutation and luni-planetary terms). The paper presents these differences computed by means of the VSOP87 series (Bretagnon and Francou, 1988). In particular, in analysing observations at the microarcsecond level these expressions will permit an experimental check of geodesic precession in a more direct manner than it is done nowadays (Bertotti et al., 1987).

scholarly journals Sistemas Geodésicos de Referência: Rumo ao GGRS/GGRF

2020 ◽  
Vol 72 ◽  
pp. 962-982
Author(s):  
Regiane Dalazoana ◽  
Sílvio Rogério Correia De Freitas
Keyword(s):  
Reference Frame ◽  
Reference System ◽  
Terrestrial Reference Frame ◽  
Earth Observation ◽  
Geodetic Reference System ◽  
International Terrestrial Reference Frame ◽  
Observation Systems ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System ◽  
Geodetic Reference Frame

O estabelecimento de Sistemas Geodésicos de Referência globais integrando características geométricas e físicas é um dos desafios atuais da Geodésia, principalmente devido às demandas de diversas áreas do conhecimento de que as informações relacionadas aos Sistemas de Observação da Terra (EOS – Earth Observation Systems), sejam integradas em Redes Geodésicas de Referência (RGRs) com uma acurácia de 10-9 ou melhor. O surgimento das técnicas de posicionamento espacial trouxe melhora significativa na qualidade posicional e possibilitou a substituição das RGRs clássicas por redes modernas com características globais. Hoje, a questão das coordenadas de caráter geométrico, está bem resolvida com o ITRS/ITRF (International Terrestrial Reference System/International Terrestrial Reference Frame). Todavia, aspectos associados a diversos processos físicos, tais como os reflexos das redistribuições de massa, não são atendidos por referenciais puramente geométricos. A aprovação da resolução para o GGRS/GGRF (Global Geodetic Reference System/Global Geodetic Reference Frame) surge com a visão da integração entre o referencial terrestre, o celeste, um referencial com características físicas para as altitudes e a nova rede global de gravidade absoluta. Esforços têm sido feitos para definição e realização deste referencial global para as altitudes. É uma tarefa complexa em vista das características clássicas dos referenciais verticais, heterogeneidade em termos de qualidade e distribuição espacial de dados necessários, principalmente os relacionados ao campo de gravidade da Terra. Apresentam-se como grandes desafios para o futuro a necessidade de estabelecimento de procedimentos padrão para a integração ao referencial altimétrico global e a precisão necessária para o estabelecimento dos EOS.

scholarly journals Definition and realization of the celestial intermediate reference system

2007 ◽  
Vol 3 (S248) ◽  
pp. 367-373 ◽  
Author(s):  
N. Capitaine
Keyword(s):  
Reference System ◽  
Reference Systems ◽  
The Earth ◽  
Fundamental Astronomy ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System ◽  
Rotation Of The Earth ◽  
Definition Of ◽  
Sidereal Rotation ◽  
Celestial Reference System

AbstractThe transformation between the International Terrestrial Reference System (ITRS) and the Geocentric Celestial Reference system (GCRS) is an essential part of the models to be used when dealing with Earth's rotation or when computing directions of celestial objects in various systems. The 2000 and 2006 IAU resolutions on reference systems have modified the way the Earth orientation is expressed and adopted high accuracy models for expressing the relevant quantities for the transformation from terrestrial to celestial systems. First, the IAU 2000 Resolutions have refined the definition of the astronomical reference systems and transformations between them and adopted the IAU 2000 precession-nutation. Then, the IAU 2006 Resolutions have adopted a new precession model that is consistent with dynamical theories and have addressed definition, terminology or orientation issues relative to reference systems and time scales that needed to be specified after the adoption of the IAU 2000 resolutions. These in particular provide a refined definition of the pole (the Celestial intermediate pole, CIP) and the origin (the Celestial intermediate origin, CIO) on the CIP equator as well as a rigorous definition of sidereal rotation of the Earth. These also allow an accurate realization of the celestial intermediate system linked to the CIP and the CIO that replaces the classical celestial system based on the true equator and equinox of date. This talk explains the changes resulting from the joint IAU 2000/2006 resolutions and reviews the consequences on the concepts, nomenclature, models and conventions in fundamental astronomy that are suitable for modern and future realizations of reference systems. Realization of the celestial intermediate reference system ensuring a micro-arc-second accuracy is detailed.

scholarly journals COMPATIBILIZAÇÃO DE REFERENCIAIS DE COORDENADAS E VELOCIDADES COM ESTIMATIVA DE PRECISÃO

2015 ◽  
Vol 21 (3) ◽  
pp. 590-609
Author(s):  
Alessandro Salles Carvalho ◽  
William Rodrigo Dal Poz ◽  
Ana Paula Camargo Larocca
Keyword(s):  
Earth Rotation ◽  
Reference System ◽  
System Service ◽  
International Earth Rotation ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System

Resumo:As transformações de coordenadas e velocidades entre as realizações do ITRS (International Terrestrial Reference System), bem como a atualização de coordenadas, tornar-se-ão tarefas rotineiras em levantamentos geodésicos devido ao emprego de sistemas de referência dinâmicos e ao movimento das placas tectônicas. Neste estudo foram realizadas compatibilizações de sistemas de referência (ITRF2000, ITRF2005 e ITRF2008) das coordenadas e velocidades com suas respectivas estimativas de precisão, via propagação de variância, de 11 estações distribuídas nas placas tectônicas Norte e Sul Americanas e da Eurásia. Foi verificado com base nas coordenadas nos ITRF2008, época 2005 e ITRF2005, época 2000, obtidas pelo IERS (International Earth Rotation and Reference System Service), que 54,55% das discrepâncias planimétricas são centimétricas e 45,45% decimétricas. Comparando as coordenadas no ITRF2008, época 2005,0 e no ITRF2000, época 1997,0 verificou-se discrepâncias planimétricas da ordem do decímetro para todas as estações. Confrontando as coordenadas ITRF2000, época 1997,0 obtidas pelo IERS com as calculadas com base nas transformações entre sistemas de referência e atualizações verifica-se discrepâncias planimétricas da ordem do milímetro em 72,73% dos casos e da ordem do centímetro em 27,27%. As análises realizadas confirmam a necessidade de atualizar e compatibilizar o referencial das coordenadas e velocidades para aumentar a acurácia do posicionamento

scholarly journals Integração de redes GNSS: uma proposta metodológica de densificação da rede SIRGAS na América do Sul

2011 ◽  
Vol 17 (4) ◽  
pp. 477-495
Author(s):  
Maria Lígia Chuerubim ◽  
João Carlos Chaves ◽  
João Francisco Galera Monico
Keyword(s):  
Global Positioning System ◽  
Reference System ◽  
Positioning System ◽  
Regional Network ◽  
International Gnss Service ◽  
Exchange Format ◽  
Global Positioning ◽  
International Terrestrial Reference System ◽  
Terrestrial Reference System ◽  
America Latina

A característica continental do Brasil implica na necessidade de constantes desafios científicos em pesquisas espaciais e tecnológicas, que visam contribuir ao engajamento de centros de pesquisas, fornecendo instrumentos às atividades espaciais no país e no mundo, ampliando as perspectivas de aplicação de técnicas geodésicas como o GPS (Global Positioning System). Neste contexto, destaca-se a contribuição ao IGS (International GNSS Service) dos centros de locais de análise SIRGAS (Sistema de Referência Geocêntrico para as Américas) e o IGS-RNAACSIR (IGS Regional Network Associate Analysis Centre for SIRGAS), que disponibilizam soluções semanais no formato SINEX (Software INdependent EXchange Format), referenciadas ao ITRS (International Terrestrial Reference System), que posteriormente são integradas no contexto de uma solução regional pelo DGFI (Deutsches Geodätiches Forschungsinstitut), denominada IGS-RNAACSIR. Nesta perspectiva, este projeto apresenta uma metodologia de integração de redes GNSS locais no contexto de uma solução regional para o Brasil, com base em dados gerados pelas redes ativas RBMC (Rede Brasileira de Monitoramento Contínuo), GNSS SP (Rede GPS Ativa do Oeste do Estado de São Paulo, e em soluções SIRGAS no formato SINEX, utilizando o princípio da combinação das equações normais pelo MMQ (Método dos Mínimos Quadrados), contribuindo com a manutenção e densificação da rede SIRGAS na América Latina.

Control of following Force in Gimbal Suspension by Programmed Transfer of Vehicle in the Class of Spiral-Screw Trajectories

2020 ◽  
Vol 8 (6) ◽  
pp. 01-15
Author(s):  
Kravets V.V ◽  
Kravets Vl.V ◽  
Artemchuk V.V.
Keyword(s):  
Mathematical Models ◽  
Reference System ◽  
Driving Force ◽  
Reference Systems ◽  
Structural Scheme ◽  
Inertial Space ◽  
Transport Vehicle ◽  
Terrestrial Reference System ◽  
Force Components ◽  
Speed Mode

The programmed transfer of the transport vehicle in space is carried out in the class of helical trajectories, using forcing (throttling) and deviation of the following driving force in the gimbal. The paper introduces the mathematical models of the transport vehicle kinetics in space in the terrestrial reference system and in the basis of the natural trihedral of the trajectory, using the quaternion form. The kinematics of the transport vehicle in the fixed and mobile reference systems, as well as the orientation of the natural trihedral in the inertial space, are represented by the hodograph of the program helix trajectory in vector and quaternion forms. The components of the controlling driving force in the basis of the natural trihedral are determined by the kinetostatics equations of the programmed transfer of the transport vehicle along a helical trajectory in the required speed mode. The authors proposed a structural scheme of the gimbal suspension, providing the required driving force components. The authors considered two possible sequences of rotations of the moving gimbal rings and demonstrated their equivalence. Laconic formulas are established for the control angles of rotation of the moving gimbal rings.

Sign in / Sign up

Export Citation Format

Share Document